usage flags for bitcoin addresses on OpenPGP keys

Nicholas Cole nicholas.cole at
Fri Jan 17 09:07:45 CET 2014

On Fri, Jan 17, 2014 at 7:45 AM, Werner Koch <wk at> wrote:
> On Thu, 16 Jan 2014 23:00, dkg at said:
>> some defined usage flags aren't settable).  I wonder if gpg should
>> expose a "bitcoin address" capability (within --expert mode) and set
>> such a subkey up as having no usage flags set, and a notation like:
>>  extended-usage at
> I would be fine with that.  We need to see how implementations act upon
> all zero keyflags.
>> in human-readable form, gpg could indicate this as "Usage: B"
> I think this is to specific.  An "X" or a "T" may indicate that some
> extended usage is expected.

I'd be willing to bet that gnupg will be around longer than bitcoin....

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